Charge injection into insulators / B. Bouattou (1987) 

Public ISBD Titre : Charge injection into insulators Type de document : texte imprimé Auteurs : B. Bouattou, Auteur ; John Lowell, Directeur de thèse Editeur : Manchester : [s.n.] Année de publication : 1987 Importance : 94 f. Présentation : ill. Format : 30 cm. Note générale : Mémoire de Master : Electrical engineering : Victoria University of Manchester : 1987 Mémoire de Master en Electrotechnique Annexes [15] f.. - Bibliogr. [3] f. Langues : Anglais (eng) Mots-clés : Polymers Charge transfer Conduction mechanism Polarisation Index. décimale : Ms00487 Résumé : This thesis describes a new techniques to obtain information about the mechanisms of conduction in polymers by measuring the charge transfer in repeated contacts with liquid mercury. Conventinal conductivity measurements employing electrodes and methods based on the surface potential cannot reliably distinguish between the motion of free carriers and polarisation currents associated with dipole orientation. Our technique in contrast can provide a good indication of conduction mechanism and can distinguish true charge from polarisation charge. The experiments show that charge is immobile on PTFE and SAPHIRE; free intrinsic carriers are responsible for the conduction in NYLON. Novel behaviour is found for PS, PMMA, PVC; charge remains close to the surface for short time between contacts. However, for longer time, experiment shows that the charge is mobile but the mechanism of motion is unclear. Charge injection into insulators [texte imprimé] / B. Bouattou, Auteur ; John Lowell, Directeur de thèse . - Manchester : [s.n.], 1987 . - 94 f. : ill. ; 30 cm. Mémoire de Master : Electrical engineering : Victoria University of Manchester : 1987 Mémoire de Master en Electrotechnique Annexes [15] f.. - Bibliogr. [3] f. Langues : Anglais (eng) Mots-clés : Polymers Charge transfer Conduction mechanism Polarisation Index. décimale : Ms00487 Résumé : This thesis describes a new techniques to obtain information about the mechanisms of conduction in polymers by measuring the charge transfer in repeated contacts with liquid mercury. Conventinal conductivity measurements employing electrodes and methods based on the surface potential cannot reliably distinguish between the motion of free carriers and polarisation currents associated with dipole orientation. Our technique in contrast can provide a good indication of conduction mechanism and can distinguish true charge from polarisation charge. The experiments show that charge is immobile on PTFE and SAPHIRE; free intrinsic carriers are responsible for the conduction in NYLON. Novel behaviour is found for PS, PMMA, PVC; charge remains close to the surface for short time between contacts. However, for longer time, experiment shows that the charge is mobile but the mechanism of motion is unclear.

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Code-barres	Cote	Support	Localisation	Section	Disponibilité	Spécialité	Etat_Exemplaire
Ms00487	Ms00487	Papier + ressource électronique	Bibliothèque Annexe	Mémoire de Master	Disponible	Electrotechnique	Consultation sur place/Téléchargeable

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